[all-commits] [llvm/llvm-project] 0f607f: [VPlan] Simplify 'or x, true' -> true.

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0f607f3df54e22896b484510f0c1ccfb718de67a
      https://github.com/llvm/llvm-project/commit/0f607f3df54e22896b484510f0c1ccfb718de67a
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-04-13 (Sun, 13 Apr 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanPatternMatch.h
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/test/Transforms/LoopVectorize/SystemZ/pr47665.ll
    M llvm/test/Transforms/LoopVectorize/X86/constant-fold.ll

  Log Message:
  -----------
  [VPlan] Simplify 'or x, true' -> true.

Add additional OR simplification to fix a divergence between legacy and
VPlan-based cost model.

This adds a new m_AllOnes matcher by generalizing specific_intval to
int_pred_ty, which takes a predicate to check to support matching both
specific APInts and other APInt predices, like isAllOnes.

Fixes https://github.com/llvm/llvm-project/issues/131359.



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